So if anyone could help me out that ICS update.app it would be very helpful, and if you also know a way to root without using the power button because mine is broken or if you think those tutorials will help... any ideas and suggestions are welcome.

I only need ROOT, I can manage afterwards, I'll install ROM Manager, flash CWM Touch and via adb reboot recovery or Quickboot (The App) I can go to recovery and flash a better ROM than the Update.app stock one.